Agitating or stirring device for boiling liquids.



Jenn L. MAYEn, or cHIoAGo, ILnmors.

AGITATING 0R STIRRING DEVICFOR BOILIN Gr LIQIDS.

Application sied october 2, 1914. serial No. 864,644. i

To all whom t may concern.'

Beit known that I, JOHN L.v MAYER, la citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Agitating or Stirring Devices for Boiling Liquids; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part ofthis specification.

This invention relates to a novel agitating or stirring device for automatically stirring relatively light liquids, such for instance, as milk, compounds containing milk, jellies and the like, when boiling the same to prevent the liquid sticking to the bottom of the receptacle and being thereby burned, and thereby avoid the necessity of manually stirring the boiling liquid and the incon venience of standing over the heat during the boiling period.

In the drawings Figure 1 is a perspective View of a stirring or agitating device embodying my invention.

Fig. 2 shows the position thereof in a cooking receptacle, the receptacle being shown in section.

Fig. 3 is a vertical section of the device.

A device embodying my invention comprises a base or body 10 that is provided at its periphery with a downwardly facing seat 11 which rests upon the bottom 13 of the receptacle 12 in which the liquid is being boiled, thelower side of the said body or base, surrounded by the seat 12, being concave so as to provide therebelow a chamber 14 to contain a portion of the liquid being boiled. Preferably the device is provided with an upstanding hand piece 15 of any suitable form so that it may be easily han# dled. The base or body 10, as herein shown, is of circular contour, but the peripheral configuration of the base may be varied' diameterto coverA but a very smaillwfrlafv:-`-

rtional part of the Vbottom of the cooking vessel, the relative areas of the said agitator and vessel herein shown being in the neighborhood of one to twelve.

In the use of the device it is placed upon i the bottom of the receptacle 12 in the manner shown in Fig. 2. When the liquid reaches the boiling temperature, the agitation of the liquid in the chamber 14 at the base of the device and the variations of air pressure within said chamber cause the device to tip sidewise so as to permit an interchange of pressures between the chamber 14 and the space within the receptacle exterior to the device through the space between the raised portion or seat 11 and the bottom of the receptacle. When thedevice is so tipped the interchange of pressures through the space beneath the raised edge of the seat acts with a reactive effect to cause the device to be shifted llaterally over the bottom of the receptacle, so that the part of the seat 11 then in contact with the receptacle bottom scrapes over the said bottom in a manner to dislodge any portion of the liquid compound which tends to stick to said bottom. Thereby the liquid is prevented from burning. This lateral shifting of the device over the Vbottom of the receptacle is irregular with respectto direction but it has beenA demonstrated that the movement of the device under the conditions described is suiiiciently rapid and extensive as to touch all parts of the bottom of the receptacle with such frequency as to prevent the liquid adhering to the bottom and t0 thereby prevent the burning thereof. Such lateral movement of the device over the bottom of the receptacle may be aifected to some extent by the ebullition of the liquid in the re ceptacle exterior to the device, but is principally due to the action of the boiling liquid within the chamber 14 and the variations of the pressure within said chamber as compared to the pressure exterior thereto.

The device may be made of any suitable material which is suliciently heavy to prevent it floating in the liquid. Glass, porcelain and the like are suitable materials and, by reason of the sanitary properties thereof, are recommended.

I claim as my invention As an article of manufacture, a stirring device, comprising a circular shaped base of concavo-convex formation to provide a therewith for the chamber also to serve In testimony that 4Ioiaim the foregoing 30 as my invention l affix my signature in the presence of two Witnesses, this 25th day of September, A. D. 19142.V

JOHN L. MAYER.

chamber Within the bottom face thereof, and a central stem forming a handle rising from the convex side of the hase, Sii hase haifii'g a marginal edge vforium-ag' `a Hat contacting rim surface concentrcallyof ythe Chamber attempted when the baee is at rest upon the bottom of a 'receptacle to form, a closure Witnesses:

TL.- HLL. as a scraper When the base is in motion. RUTH E. ZETTERVALL.

Y"Cii's bf this p'a'tentfmaybe btained foi fve wients each, thy addre'ssi'ng the Cdmmissioner '6i Patents, WashingtongDLC. 

